Adrien jules alexis dumoulik



(No Model.) 2 Sheets-Sheet 1.

A. J. A. DUMOULIN.

CONTINUOUS APPARATUS OPERATEDBY GENTRIFUGAL POWER. No. 338,393. Patented Mar. 23, 1886.

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A. J. A. DUMOULIN.

CONTINUOUS APPARATUS OPERATED BY GENTRIPUGAL POWER. No. 338,393.

Patented Mar. 23, 1886.

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UNITED STATES PATENT OFFICE.

ADRIEN J ULES ALEXIS DUMOULIN, OF PARIS, FRANCE, ASSIGNOR TO OOMPAGNIE DE FIVES LILLE.

CONTINUQUS APPARATUS OPERATED BY CENTRIFUGAL POWER.

SPECIFICATION forming part of Letters Patent No. 338,393, dated March Application filed July 23, 1885. Serial No. 172,412.

To aZZ whom it may concern:

Be it known that I, ADRIEN J ULES ALEXIS DUMOULIN, a citizen of the Republic of France, residing at Paris, in said Republic, have invented a new and useful Improvement in Continuous Centrifugal Machines, of which the following is a specification.

This invention relates to that class of cen trifugal machines in which the basket and an internal drum provided with a spiral flange fitting to the interior of the basket have rotary motion at different velocities, to regulate the passage through the machine of the matter to be dried.

My invention consists in certain means, hereinafter described and claimed, of driving the basket and the spirally-threaded drum,- and it further consists in a novel combination of parts of the machine, hereinafter described and claimed,whereby a free discharge of the dried product from the bottom of the drum is provided for while driving the machine from below the drum.

Figures 1 and 2 in the accompanying drawings, represent two vertical sections at right angles to each other, passing through the axis of the separator. Fig. 3 is a diagram illustrating a plan of the driving belt and pulleys.

Similarletters of reference designate corresponding parts in the several figures.

B his a mixing apparatus, consisting of a hopper containing a horizontal shaft with helicoidal blades, and into which the matters to be dried are fed, and from which they pass to the separating apparatus proper through a spout, '0, which is fitted with a valve, n, to regulate their passage.

0 is the upright rotary shaft of the separator, having firmly secured to its upper end the truncated perforated or reticulated c011- ical filtering-drum, A, at the top of which is a hollow dome, C, the hub I of which, by which it and the drum A are secured to the shaft, is furnished with wings i, which form a centrifugal pump which throws out the matter from the said dome between the said conical drum A and an inner conical drum, B, which is secured to a hollow sleeve, 1), which surrounds the shaft 0. The hollow conical drum B is (No model.)

furnished externally with double helicoidal flanges s s, the said flanges filling the annular space formed between the drums A and B by running nearly in close contact with the interior surface of the filteringdrum A. The shaft 0 of the filteringdrum is furnished with a pulley, P, through which it and the said drum and the dome 0 receive rotary motion.

The sleeve 1), which carries the drum B, is furnished with a pulley, 1?, through which it receives motion inthe same direction and at a slightly less velocity than that of the shaft 0.

1? is a driving-pulley, which transmits motion to the pulleys P and P by means of the endless belt 1', which runs over an obliquelyarranged guide-pulley, P", which is adjustable by means of a screw, T, (see Fig. 1,) for the purpose of tightening said belt.

D is astationary but removable casing surrounding the drums A and B, and having in its lower part a circular gutter for the reception of the molasses or other liquids thrown off by centrifugal force, the said casing having a removable cover, in which is a central opening for the feedingdome G of the filtering cylinder or drum A.

K is a cylindroconical reservoir, situated below the drums A and B, for the reception of the sugar or dried matters after their passage through the annular space between the drums A and B, the said reservoir having an inclined spout, L 00, through which the said matters fall directly into barrels, bags, or other receptacles. This inclined spout prevents the dried matters from falling on the pulleys P P and upon the belt 1-.

The operation of the machine is as follows: The matters to be dried or separated being supplied to the mixer B h, pass thence, bythe spout 1), into the receiving-dome G of the filtering-drum, whose wingsi act, as has been above mentioned, in the manner of a centrifugal pump, delivering the matters between space with a continuous movement, falling afterward into the inclined spout L x and into the receptacles provided below. The filteringdrum has its internal face smooth and perforated with small holes, according to the size of the solid particles to be retained by the drying process. The drum B, which is concentrio with the drum A, also has openings a little larger, necessary for the passage of the liquid-washing agent. Owing to the difference of diameter between the pulleys P P, the drum B turns more slowly than the drum A. Experience has demonstrated that for the best operation the drum B should make from sixty to one hundred and eighty revolutions per minute less than the drum A. The relative displacement of the double helicoidal flange, resulting from the differential movement of rotation of the two drums A and B, has for its object to regulate, in proportion to their drying, the gradual descent of the matters under treatment toward thelower part of the drums, whence they escape tangentially into the cylindro-conical reservoir K, whence they pass by the inclined spout L w to the barrels or bags appointed to receive them. The pitch of the double helicoidal flange may be in either direction convenient for operation, the direction of rotation of the two drums being in a corresponding direction-that is to say, the pitch being right-handed, the direction of rotation is right-handed-and consequently as the helix moves slower than the outer drum, A, the effect is the same as if its direction of rotation was reversed or lefthanded. This arrangement has for its object to avoid the inconvenience which might result from the sliding of the belt 0* up on the pulleysan inconvenience which might have for its consequeiice the raising up of the matters in place of regulating their descent, and hence the retardation which it effects on the matters descending between the drums. It will thus be understood that the action of the helices has not for its object to extract the matters to be dried, but to retain them in the case of extreme fluidity and on the contrary to aid their descent in the case of insufficient plasticity. In short, it has for its object to regulate the discharge, in spite of accidental variations, of

the richness in solid matters of the matters under treatment.

The means which I employ for obtaining a differential movement of rotation of the two drums are of great importance. These are best shown in Fig. 3, one and the same belt receiving its movement from the driving-pulley P, serving both to drive the filtering-drum A and produce at the same time the differential movement of the helically-flanged drum B by means of only three pulleys, P P P, besides the pulley P, the said belt passing successively, first, on the pulley P of the filtering-drum mounted on the principal shaft 0; second, on the drivingpulley P; third, on that, P, actuating the helically-flanged drum, and mounted upon its sleeve or hollow shaft b, loose upon the shaft 0; fourth, upon the oblique guide-pulley P, furnished with the tighteningscrew T, for regulating the tension, thereby assuring a uniform adherence on all the system of pulleys, and returning, finally, to the pulley P, thus closing the continuous circuit shown in the last-mentioned figure.

The respective diameters of the two pulleys P P are determined in a manner to give to each of the drums A and B such a number of revolutions that the helically-flanged drum B makes from sixty to one hundred and eighty revolutions per minute less than the filteringdrum A. In order to effect this, I provide three or four changeable pulleys, P, all of such less diameters than B as are convenient to produce the degrees of difference of revolutions rendered necessary by the nature of the matters under treatment. These differences of speed have the effect of prolonging or diminishing the time during which the matters treated are retained in the apparatus and submitted to the action of centrifugal force and of washing-liquids.

Practice has shown that a retention of from two to twelve seconds is sufficient to obtain a perfect drying and purifying by reason of the velocity of the drum, of which the diameter, increasing from the entrance to the exit of the matters, permits the latter to spread themselves all the way from the top to the bottom of the drum, which favors their permeability and the presentation of all the surface of the solid matters to a clarifying action. These differences in the number of revolutions of the two drums, which are susceptible of still greater variations in proportion to the pitch of the helical flanges, regulate at will the displacement of the matters, and consequently the work done by the apparatus.

By the hereinabovedescribed arrangement of the delivery apparatus with a lateral discharge, I am enabled to have a continuous discharge with the driving-pulleys below the basket,which is the best place for them, as in that position they do not interfere with the continuous feeding of the machine, and by the employment of a single band and single driving-pulley to drive the basket and the spirallyflanged drum at different velocities I am enabled to simplify the driving-gear of the machine.

I do not claim the combination with the rotary basket or filtering-drum of a centrifugal machine, of a rotary spirally-flanged drum placed inside of said basket; but

WVhat I claim as my invention, and desire to secure by Letters Patent, is-

I 1. The combination,with the filtering drum or basket A and its shaft 0, and the helicallyflanged drum B and its hollow shaft Z), of the pulleys P P, of different sizes, placed on the said shafts O 1) below the said drums, the driving-pulley P, the guide-pulley P, the single belt 1-, running on all of the said pulleys, and the tensionscrew T, all substantially as herein described, and for the purpose herein set forth. 2. The combination of the filtering drum or ICO IIO

basket A, the spirally-flanged drum B, the In testimony whereof I have signed this 10 reservoir K, having the inclined lateral spout specification in the presence of two subscrib- L 00 below'the said drums, and the shafts 0 ing witnesses. B of the said drums extended downward 5 through the said reservoir and furnished be- ADRIEN JULES ALEXIS DUMOULIN.

10w said reservoir with pulleys P P, over which the dried substance is delivered by the Witnesses: said spout L 02, substantially as herein de-- G. GREMERs, scribed. Row. M. HoorER. 

